/* ─── Reset & Base ──────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg:     #FAF7F4;
  --navy:   #0D1B2A;
  --gold:   #C9A84C;
  --gold-lt:#E8D5A3;
  --mid:    #7A6F65;
  --grey:   #EDE9E3;
  --font-display: 'Instrument Serif', 'Noto Sans KR', 'Apple SD Gothic Neo', sans-serif;
  --font-sans: 'Noto Sans KR', 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --ease: cubic-bezier(0.76, 0, 0.24, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg);
  color: var(--navy);
  font-family: var(--font-sans);
  cursor: none;
  overflow-x: hidden;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-synthesis: none;
}

a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }

/* ─── Custom Cursor ─────────────────────────────────────────────── */
#cursor {
  position: fixed;
  width: 10px; height: 10px;
  background: var(--gold);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width 0.3s var(--ease), height 0.3s var(--ease), background 0.3s;
}
#cursor-ring {
  position: fixed;
  width: 40px; height: 40px;
  border: 1px solid rgba(201,168,76,0.35);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transform: translate(-50%, -50%);
  transition: width 0.3s var(--ease), height 0.3s var(--ease);
}
body:has(a:hover) #cursor,
body:has(button:hover) #cursor { width: 50px; height: 50px; background: var(--gold); }

/* ─── Loader ────────────────────────────────────────────────────── */
#loader {
  position: fixed;
  inset: 0;
  background: var(--navy);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.9s var(--ease), visibility 0.9s;
}
#loader.hidden { opacity: 0; visibility: hidden; }

.loader-inner { text-align: center; }
.loader-logo {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: #FAF7F4;
  overflow: hidden;
}
.loader-logo span {
  display: inline-block;
  opacity: 0;
  transform: translateY(100%);
  animation: loader-slide 0.8s var(--ease) forwards;
}
.loader-logo span:nth-child(1) { animation-delay: 0.1s; }
.loader-logo span:nth-child(2) { animation-delay: 0.18s; }
.loader-logo span:nth-child(3) { animation-delay: 0.26s; }
.loader-logo span:nth-child(4) { animation-delay: 0.34s; }
.loader-logo span:nth-child(5) { animation-delay: 0.42s; }

.loader-tagline {
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--gold);
  margin-top: 0.7rem;
  opacity: 0;
  letter-spacing: 0.05em;
  animation: fade-in 0.6s ease 0.8s forwards;
}

@keyframes loader-slide { to { opacity: 1; transform: translateY(0); } }
@keyframes fade-in { to { opacity: 1; } }

.loader-bar {
  width: 100px; height: 1px;
  background: rgba(250,247,244,0.1);
  margin: 2rem auto 0;
  overflow: hidden;
}
.loader-progress {
  height: 100%;
  background: var(--gold);
  width: 0;
  animation: load-progress 1.8s var(--ease) 0.5s forwards;
}
@keyframes load-progress { to { width: 100%; } }

/* ─── Nav ───────────────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.8rem 3rem;
  z-index: 100;
  transition: background 0.4s, backdrop-filter 0.4s, padding 0.4s;
}
nav:hover {
  background: rgba(13,27,42,0.75);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(201,168,76,0.2);
}
nav.scrolled {
  background: rgba(13,27,42,0.92);
  backdrop-filter: blur(20px);
  padding: 1.2rem 3rem;
  border-bottom: 1px solid rgba(201,168,76,0.12);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #FAF7F4;
}
.nav-logo span { color: var(--gold); }

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}
.nav-links a {
  position: relative;
  color: rgba(250,247,244,0.55);
  transition: color 0.3s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width 0.4s var(--ease);
}
.nav-links a:hover { color: #FAF7F4; }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--gold); }

.nav-cta {
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  background: transparent;
  color: var(--gold);
  padding: 0.55rem 1.4rem;
  border-radius: 100px;
  border: 1px solid rgba(201,168,76,0.5);
  transition: background 0.3s, border-color 0.3s, color 0.3s;
}
.nav-cta:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy);
}

/* ─── Hero ──────────────────────────────────────────────────────── */
#hero {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 0 3rem 5rem;
  overflow: hidden;
  background: var(--navy);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/generated/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.55;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: flex-end;
  gap: 4rem;
}

.hero-label {
  font-size: 0.78rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--gold);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.hero-label::before {
  content: '';
  display: block;
  width: 28px; height: 1px;
  background: var(--gold);
  flex-shrink: 0;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 8vw, 8.5rem);
  line-height: 0.92;
  letter-spacing: -0.02em;
  font-weight: 400;
  color: #FAF7F4;
}
.hero-headline em {
  font-style: italic;
  color: var(--gold);
}

.hero-tagline {
  margin-top: 2.5rem;
  font-size: 0.8rem;
  font-weight: 300;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(250,247,244,0.35);
}

.hero-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3rem;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 2.2rem;
  border: 1px solid rgba(201,168,76,0.5);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: #FAF7F4;
  position: relative;
  overflow: hidden;
  transition: color 0.4s var(--ease), border-color 0.4s;
  white-space: nowrap;
}
.hero-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.hero-cta:hover { color: var(--navy); border-color: var(--gold); }
.hero-cta:hover::before { transform: scaleX(1); }
.hero-cta span, .hero-cta .arrow { position: relative; z-index: 1; }
.hero-cta:hover .arrow { transform: translateX(5px); }
.arrow { transition: transform 0.3s var(--ease); }

.hero-scroll-hint {
  font-size: 0.68rem;
  font-weight: 300;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(250,247,244,0.25);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  writing-mode: vertical-lr;
}

/* ─── Strip Marquee ─────────────────────────────────────────────── */
.strip {
  background: var(--gold);
  padding: 0.85rem 0;
  overflow: hidden;
}
.strip-track {
  display: flex;
  white-space: nowrap;
  animation: strip-scroll 22s linear infinite;
}
.strip-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-right: 3rem;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
}
.strip-dot {
  width: 4px; height: 4px;
  background: var(--navy);
  border-radius: 50%;
  flex-shrink: 0;
  opacity: 0.35;
}
@keyframes strip-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ─── Section Eyebrow ───────────────────────────────────────────── */
.section-eyebrow {
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--gold);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.section-eyebrow::before {
  content: '';
  display: block;
  width: 20px; height: 1px;
  background: var(--gold);
}

/* ─── Product Section ───────────────────────────────────────────── */
.product-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 85vh;
}

.product-image {
  position: relative;
  overflow: hidden;
  background: var(--navy);
}
.product-image img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}
.product-image:hover img { transform: scale(1.03); }

.product-content {
  background: var(--navy);
  padding: 7rem 4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  font-weight: 400;
  color: #FAF7F4;
  margin-bottom: 1.8rem;
}
.section-title em { font-style: italic; color: var(--gold); font-family: var(--font-display); }

.section-desc {
  font-size: 0.92rem;
  font-weight: 300;
  line-height: 1.95;
  color: rgba(250,247,244,0.5);
  max-width: 420px;
  margin-bottom: 3rem;
  letter-spacing: 0;
}

.product-specs {
  display: flex;
  gap: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid rgba(250,247,244,0.08);
}
.spec-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-style: italic;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.spec-label {
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.02em;
  color: rgba(250,247,244,0.3);
}

/* ─── Science Section ───────────────────────────────────────────── */
.science-section {
  background: var(--bg);
  padding: 9rem 3rem;
}

.science-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8rem;
  align-items: center;
  max-width: 1300px;
  margin: 0 auto;
}

.science-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.2vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  font-weight: 400;
  color: var(--navy);
  margin-bottom: 1.6rem;
}
.science-title em { font-style: italic; color: var(--gold); font-family: var(--font-display); }

.science-desc {
  font-size: 0.92rem;
  font-weight: 300;
  line-height: 1.95;
  color: var(--mid);
  margin-bottom: 2.5rem;
  letter-spacing: 0;
}

.science-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.fact-item {
  padding: 1.4rem 1.5rem;
  border: 1px solid rgba(13,27,42,0.07);
  background: white;
}
.fact-icon {
  font-size: 0.6rem;
  color: var(--gold);
  margin-bottom: 0.8rem;
}
.fact-title {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--navy);
  margin-bottom: 0.4rem;
}
.fact-desc {
  font-size: 0.78rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--mid);
  letter-spacing: 0;
}

.science-image {
  position: relative;
  border-radius: 2px;
  overflow: hidden;
  aspect-ratio: 1;
}
.science-image img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.science-image-badge {
  position: absolute;
  bottom: 1.8rem;
  left: 1.8rem;
  background: rgba(13,27,42,0.85);
  backdrop-filter: blur(10px);
  padding: 1rem 1.4rem;
  border-left: 2px solid var(--gold);
}
.badge-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-style: italic;
  color: #FAF7F4;
  margin-bottom: 0.2rem;
}
.badge-sub {
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--gold);
}

/* ─── Benefits Section ──────────────────────────────────────────── */
.benefits-section {
  background: var(--navy);
  padding: 9rem 3rem;
}

.benefits-header {
  text-align: center;
  margin-bottom: 5rem;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid rgba(250,247,244,0.07);
  max-width: 1300px;
  margin: 0 auto;
}
.benefit-item {
  padding: 3rem 2.5rem;
  border-right: 1px solid rgba(250,247,244,0.07);
  transition: background 0.3s;
}
.benefit-item:last-child { border-right: none; }
.benefit-item:hover { background: rgba(201,168,76,0.04); }

.benefit-number {
  font-size: 0.68rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--gold);
  opacity: 0.6;
  margin-bottom: 1.8rem;
}
.benefit-title {
  font-size: 1rem;
  font-weight: 500;
  color: #FAF7F4;
  margin-bottom: 1rem;
  line-height: 1.5;
  letter-spacing: 0;
}
.benefit-desc {
  font-size: 0.82rem;
  font-weight: 300;
  line-height: 1.85;
  color: rgba(250,247,244,0.38);
  letter-spacing: 0;
}

/* ─── Skin Section ──────────────────────────────────────────────── */
.skin-section {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.skin-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/generated/synergy-bg.jpg');
  background-size: cover;
  background-position: center;
}
.skin-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(13,27,42,0.95) 45%, rgba(13,27,42,0.1));
}
.skin-content {
  position: relative;
  z-index: 2;
  padding: 6rem 3rem;
  max-width: 580px;
}

.skin-stats {
  display: flex;
  gap: 3.5rem;
  margin-top: 3rem;
}
.stat-number {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-style: italic;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.stat-label {
  font-size: 0.78rem;
  font-weight: 300;
  letter-spacing: 0.02em;
  color: rgba(250,247,244,0.38);
}

/* ─── Lifestyle Section ─────────────────────────────────────────── */
.lifestyle-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 70vh;
}

.lifestyle-content {
  background: var(--bg);
  padding: 7rem 4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.lifestyle-image {
  position: relative;
  overflow: hidden;
}
.lifestyle-image img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}
.lifestyle-image:hover img { transform: scale(1.03); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 2rem;
  border: 1px solid var(--navy);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--navy);
  position: relative;
  overflow: hidden;
  transition: color 0.4s var(--ease);
  align-self: flex-start;
}
.btn-outline::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--navy);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.btn-outline:hover { color: #FAF7F4; }
.btn-outline:hover::before { transform: scaleX(1); }
.btn-outline span, .btn-outline .arrow { position: relative; z-index: 1; }

/* ─── CTA Section ───────────────────────────────────────────────── */
.cta-section {
  background: var(--navy);
  padding: 10rem 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: 'REVIA';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-display);
  font-size: 28vw;
  font-style: italic;
  color: rgba(201,168,76,0.03);
  white-space: nowrap;
  pointer-events: none;
}

.cta-inner { position: relative; z-index: 1; }

.cta-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  font-weight: 400;
  color: #FAF7F4;
  margin-bottom: 1.5rem;
}
.cta-title em { color: var(--gold); }

.cta-desc {
  font-size: 0.88rem;
  font-weight: 300;
  color: rgba(250,247,244,0.35);
  margin-bottom: 3.5rem;
  letter-spacing: 0.08em;
}

.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1.15rem 3rem;
  background: var(--gold);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--navy);
  transition: background 0.3s, transform 0.3s;
}
.btn-gold:hover { background: var(--gold-lt); transform: translateY(-2px); }

/* ─── Footer ────────────────────────────────────────────────────── */
footer {
  background: #060E16;
  padding: 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(201,168,76,0.1);
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(250,247,244,0.5);
}
.footer-logo span { color: var(--gold); }
.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  font-size: 0.78rem;
  font-weight: 300;
  letter-spacing: 0.02em;
  color: rgba(250,247,244,0.28);
}
.footer-links a:hover { color: var(--gold); }
.footer-copy {
  font-size: 0.72rem;
  font-weight: 300;
  color: rgba(250,247,244,0.18);
}

/* ─── Scroll Reveal ─────────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.85s var(--ease), transform 0.85s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ─── Responsive ────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .benefit-item:nth-child(2) { border-right: none; }
  .benefit-item:nth-child(1),
  .benefit-item:nth-child(2) { border-bottom: 1px solid rgba(250,247,244,0.07); }
}
@media (max-width: 900px) {
  nav { padding: 1.2rem 1.5rem; }
  .nav-links { display: none; }
  .product-section,
  .lifestyle-section { grid-template-columns: 1fr; }
  .product-image { aspect-ratio: 4/3; }
  .lifestyle-image { aspect-ratio: 4/3; order: -1; }
  .product-content,
  .lifestyle-content { padding: 4rem 2rem; }
  .science-inner { grid-template-columns: 1fr; gap: 4rem; }
  .hero-content { grid-template-columns: 1fr; }
  .hero-right { align-items: flex-start; flex-direction: row; flex-wrap: wrap; gap: 1.5rem; }
  .hero-scroll-hint { writing-mode: horizontal-tb; }
  footer { flex-direction: column; gap: 1.5rem; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}
@media (max-width: 600px) {
  #hero { padding: 0 1.5rem 4rem; }
  .benefits-grid { grid-template-columns: 1fr; }
  .benefit-item { border-right: none; border-bottom: 1px solid rgba(250,247,244,0.07); }
  .skin-stats { gap: 2rem; flex-wrap: wrap; }
  .science-section,
  .benefits-section,
  .cta-section { padding: 6rem 1.5rem; }
  footer { padding: 2.5rem 1.5rem; }
}